Electric-arc lamp.



BEST VAL/BLE COPE Hu. 638,430. Patented Dec. 5, i899.. E. P. WARNER.

ELECTRIC ARC LAMP.

Appumion am Aug. e, 1898;,

(lo Hedel.) 2 Sheets-Sina l.

BEST AVAKLABLE COW No. 638,43). Patented Der:` 5, |899.

. E. P. WARNER.

ELECTRIC ARC LAMP. (Application led 6l, 1808.) uw nouer.) z sheets-sheet 2.

d .Ey @mi L afiae 5,

' concise, and'exact description. 'My' in'vent'ionrelat'es to 'electri ear c lamps, ro :andg'mo're particularly to .those wherein' the ener AvAfLAeLE com UNITED STATES* "PATENT Finca,

wiiarifns; orf oHieeOQ-ILL'INIS, ssienoln ro dirne-:WESTERN s if nn-Eornio'oonrnnr, .or SAME PLACE; 1

Y; SP.'l part of Letters EatentNo. dated'December 5', 1899-.-

"5 vvApplicationfiled August 6,1898.

Y Beit known thatl', ERNEST P. WARNER, a-4

' citizen'of theUnited' States, 'residing at Chicago,- inthe county of Cook'andState oflllinois,'have'inven'ted a certain new and useful Impr'ovement'inInclosediArc Lamps, (Case No. 66,) f which the following s'a full, clear,

'areis in closedr Such lamps maybe generallydiv'ided into two c lasse' s'- those which are; designed for connection' in multiple arc -in a constantpotential circuit 'andf those which r 5 are for connection in series'in a hightension circ'uit.- The present invention lwas intended more `-especially for use connection' with lamps of the latter class. In the construction' Aof such lamps ithas heretofore been'customzo aryto employ substantially the' same regulating vmechanism as in 'ordinary series lamps in which the are is not Vinclosedv Whenl lamps thus constructed are put in operation, however, the results obtained have. not been entirely satisfactory. It was found, in fact,

that 'such regulating mechanism was not capable of readily adapting itself to meet the new conditions of operation. In the first place in order toobtain' 'a stablelight from 3o an inclosed arc the tension at'the arc should be considerably higher and the are much longer than is usual with ordinary open-arc lamps. Again, one of the greatadvantages y which the inclosed-arc lamp possesses is that the'carbons are consumed very slowly. This of course requires the regulating or feeding mechanism to. be 'sensitive to very slight changes in the electrical conditions of the arccircuit in order that the downward feeding 4o of the carbon as its end is consumed may be very gentle and gradual, In view of these facts it 'will be Areadily understood upon a moments reiiection why the ordinary bal. an'ced-lever regulating mechanism so well known andso largely used 'for series lamps will not of itself satisfactorily operate series inc losed-arclamps, for it the'mechanism be Aadjusted 'to strike the arc. initiallyof the proper length sensitiveness to small va- 5o riations is saeriiiced,"and after the arc has Serial No. 687,908. CN'o.model 'been burning'for alittle time before the clutch will? descend suiliciently to 'cause a downward feeding: 'of the carbon the y arc will have become attenuated greatlybeyond 'the .normal and a greater 'current will be'ilowing 55 through theshunt-magnet, the electric energy 'whereof' isfjdissi'pating itself in. the fornrof heat, and si'nce'fthe carbon is so slowly consumed"thesefundesirable conditions will. be

`maintained for a considerable length of time 6o before the stressis relievedby the re ease and downward fee`ding ot'tl1ev ::a' 1bo'r1,=`\ On the' othe'r'liand, if the'usual'regulatingrnechanism be adjusted sothat it will respon 'quickly' to slight variationsof electriealpon itionthat is, if the adjustment is s fuclr .tat the, clutch will be lifted but a shortdista Ace-ot' course the'arc' which` isfstruck willl be considerably less than the proper normallength and Yit' will be 'some' time before the carbons 7o will have been sufficiently burned away to leave the requiredgap 1between their ends. My invention has'forits object to provide a device which lnaybeeasilyapplied t-o'i regulatin g mechanism of thewell-known balanced- 7 5 lever type and which will perfectly adapt such V. regulating mechanism to meet the required conditions as setiorth above. v

In accordance with my invention the regulating mechanism of the lamp is adj usted to 8o strike the are at approximately the normal length, and an-automatically-adjustable device is thereupon -put into a condition to engage andvrelease the clutch when the. latter moves in a reverse direction but a fraction of the distance which it previously traversed in strikingl the arc'. This construction enables me tostrke the arc initially at approximately the normallength Without sacrificing sensitiveness to small variations in electrical con- 9o semidiagrammatic view illustrating the rela- 10o end of the rod f.

i BESTAVLABLE cosi .tive positions occupied bythe part-s of the regulating mechanism before the' lamp is started. Fig. 3 is a similar view showing the y as applied, ifs very well known i-n -thc art and 1s illustrated ,in numerous Letters Patent granted to Charles E. Scribnerefor inst-ance,

in Patent No; 415,571, otNoveniber 19,'1Sh9J" VVhenthe lamp not ,in operatfidxnthe vclutch a', which is suspended' front the lever t) of such balanced-lever mechanism, rests upon shoulders c" c'iot the adjustable stops om, lwhose operation will be presently described, fand while in this position the ends of the'carzsflonswill be in contact,`as shown in Figs.l

and 2. l,The adjustable stops c'care pivoted upon .shafts'dV ci, moun ted in bearings ory sup,` vports d d', carried bya portion'of the framework of the lainp, and are provided ivi'th'pro'-` jecting arms c2 c?, which' rest upon and -are supported by the pm c, mounted upon the the armature-lever g of the se'rieseloctro'mag# net g'. A'compression-spring7L4 is provided', which tendsto litt the armaturedever g,'at

the same timet'ending, through the interme-y diate'j lever mechanism', to depress ,the lever b and the"clutch a, dependent theretroinf. When current is lirst passed through the lamp,

the armature-lever g is immediately attracted by the series -electroinagnet' g' and, acting through the balanced-lever mechanism, raises the lever Z2 and the' clutch o, which lifts the carbon and Yestablishes an electric are of approximately normal length. time the rod f, which is connected with .the lever g, is depressed, so that the pin Ae, carried upon its end,'is lowercd','and the arms c2 c2 ofthe stops c c are thus allowed te fall,

thereby rocking the stops upon their .pivots da. '.A glance at Fig. 3 will show the relative positions-ofthe parts at'this time. It will he observed that the ends 0310"' of the stops c care rocked into the path of the clutch a, so that upon a comparatively very slight descent of the clutch said clutch will be engaged bythe ends 'c3 of 'saidstops audwill thereupon act torelease the carbon until it has fallen'a sufficient distancel to establisha proper length of.arc, when the clutch will Y again grip the carbon-rod and maintain the saine in this posit-ion until a further adjustnient is required by the burning awayof the ends of thecarbons.

.it will be observed that although thc-up- Ward movement of the el uteh is comparatively 'lhis rod is conneotedwithvAt the saine,

great (in practice about live-sixteenths olf an inch) upon a. very slight (h iwnward movement, thereof-says, litt-le less than' one-sixteentl'ioi an inch-it will"bcengaged by the ends of the stops and caused to feed the carbon, This construction perfectly accomplishes the results -whieh yhave been pointed out as desirable in the llrst' part of this specification.

llaving thus described my invention, I claim as new and desire `to secure "by Letters Patentl 1.- In an electric-arc lamp, the combination with a vertically-movable clutch-adapted to ygrip the carbon or carboirsiip-iort, of electr magnetic*regulating. mechanism for raisingand 'lowering Athe clutch, a movable stop. o

wherewith 'the clutch. is adapted to engage, such engagement causing theelutch to relax, means for interposiiig ysaid 4stop 4in the path ot theclutch after the init-inli'aising of the carbon, anda vertically-movable pm't c operated by the regulating mechanism, ascending '.i'hon they clutch descends vand deseendin g upon asccnt'ot' the clutch, adapted when lifted to remove the stopftom ,the path ot the clutch, substantially as described'.

"2 .fIn anelectjriclamp,i-hc combi 'nation with fa vverticallymiovable lclutch adapted to grip the carbonor carbon-support, ot electromagn'eticJ-egulating 'mechanism tur raising A and lowering the clutch, pivoted stops c c where with the clutch is adapted to engage in its downward movement, such engagement causingthe clutch to relax, arms die? carried by said stops tending to rotate the stops into the path of the clutch, a'vertically-moVahle part e adapt-ed to 'engage saidvarmsto rotate the stops'out of 'the path of the clutch, and an operative connection between said verticallymovable pai-tand regulatingmechanism,

su bstantially 'as and for the pu rpose set -forti..

3. In an electric-'arc lamp, the combination -wit-h avertieally-movable clutch adapted to v grip thee; -b'on or carbon-support, of stops c c with which said clutch is adapted to engage, such engagement causing the clntchto relax, portionsrc' 'c' upon' which said'clutch rests when the lampis not in operation, regulating lever mechanism supporting said clutch and adapted', in' initially striking the are,'to raise vsaid clutch clear of the siops,a'nd means for moving said stops into the downward path of the clutch so as to engage said clutch when thelatteris lowered but a fraction of the distance which' it previously ascended when striking the arc, substantiallyas set forth.

In an electric-arc lain p,'tho combination with a vertically-movable cluteh'zulapted to grip the carbon or carbon-support, of pivoted stops c c with which said clutch is adapted to engage, such engagement,causing the clutch to relax, portions'e' c'ot said stops upon which said clutch rests whenthe lamp is not in operation, regulating lever mechanism support? Z ing said clutch and adapted, in initiallystriking the are, to also said clutch clear ot' the BEST AvAiLABLE 4ooii stops, and menus for rocking said stops about f In witness whereof I hewn nto subscribe my theii pivots to bring the'pa'rts 'e3 e5 thereof name this 15th day of Juiuv, A. D. 1508. into the downward pa-t-h of -the clutch s o as to 4` v ,n T 1 engage said clutch when the latter is lowered m ES F- 1 Afl" El" but a fraction of the distance which it previ- Witnesses:

ousiy ascended whelrsrikiug Lhe are, subi D. W'. C. TANXER,

stantiaily as seiJ forth.- I A. L'LAWRENCE@ 

